Mannual comfortably while seated suitable for all sizes of breast place the funnel wit the left hand over the nipple and press gently pull the other chamber downward from the breast with the right hand. Return the outer chamber toits original position and then continue to pull downwards this pumping procedure gently expresses milk from the breast. Equip the milk chamber with the nuk screw ring and teat to use as a feeding bottle thropughly clean all pump part instructions are included in a leaflet inside the box.